Code Definition

B1427 — Lamp Seat Belt Circuit Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1427

B1427 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1427 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1427 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) or Instrument Panel Cluster (IPC) controls the seat belt warning lamp using a low side driver that switches the lamp ground to illuminate the bulb or LED while battery voltage is supplied from the lighting feed. DTC B1427 sets when the module detects an open circuit on the lamp output, indicating a break in the lamp itself, the wiring, or a connector somewhere between the module and the lamp. The module typically performs this test during a self check at key on or while attempting to drive the lamp during the seat belt warning sequence. When this code is active th...

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